From FY 2023-24 on words those who opted Old Regime after due date [ 31st July ] automatically converted into New Regime.
Those who opted New Regime after due date late fee of Rs.5,000, which shall be reduced to Rs.1,000 if your total income is below Rs.5 lakh.

Section 80E of Income Tax Act

Under Section 80E to claim no limit on the deduction amount.

The benefit of the deduction is available for a maximum of 8 years or till the interest is paid, whichever is earlier.

loan must be taken from notified Financial institutions / Approved Charitable institutions and Banks.

It is applicable only an Old Regime.